﻿<ScrollViewer xmlns="http://schemas.microsoft.com/client/2007" 
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
              Width="250" Height="250" Background="LightSteelBlue"
              HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
  <Button Width="300" Height="300" Content="Button" Margin="20" />
</ScrollViewer>